FBI arrests 'mastermind' of Mariposa botnet computer code

International authorities have arrested a computer hacker believed responsible for creating the malicious computer code that infected as many as 12 million computers, invading major banks and corporations around the world, FBI officials have said.

The virus infected 12m computersPhoto: CLARE KENDALL

7:00AM BST 28 Jul 2010

A 23-year-old Slovenian known as Iserdo was picked up in Maribor, Slovenia, after a lengthy investigation by Slovenian Criminal Police there along with FBI and Spanish authorities.

His arrest comes about five months after Spanish police broke up the massive cyber scam, arresting three of the alleged ringleaders who operated the so-called Mariposa botnet, stealing credit cards and online banking credentials. The botnet - a network of infected computers - appeared in December 2008 and infected more than half of the Fortune 1,000 companies and at least 40 major banks.

Botnets are networks of infected PCs that have been hijacked from their owners, often without their knowledge, and put into the control of criminals.

Jeffrey Troy, the FBI's deputy assistant director for the cyber division, said that Iserdo's arrest was a major break in the investigation. He said it will take the alleged cyber mastermind off the street and prevent him from updating the malicious software code or somehow regaining control of computers that are still infected.

Officials declined to release Iserdo's real name and the exact charges filed against him, but said the arrest took place about 10 days ago and the man has been released on bond.

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"To use an analogy here," said Mr Troy, "as opposed to arresting the guy who broke into your home, we've arrested the guy that gave him the crowbar, the map and the best houses in the neighborhood. And that is a huge break in the investigation of cyber crimes."

Mr Troy said more arrests are expected and are likely to extend beyond Spain and Slovenia and include additional operators who allegedly bought the malware from Iserdo. Authorities would not say how much Iserdo supposedly charged, but said hackers could buy the software package for a certain amount, or pay more to have it customized or get additional features. Internet reports suggest the fees ranged from as much as $500 for basic packages to more than $1,300 for more advanced versions.